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Biomedical subjects

M Ueda

Publications and source records attributed to M Ueda.

At least 1,585 records · Page 88Linked to original sources
PubMed1970

Gas-Liquid Chromatographic Analysis of Indole-3-acetic Acid Myoinositol Esters in Maize Kernels.

An improved method of fractionating the myoinositol esters of indoleacetic acid (IAA) from maize kernels by gas-liquid chromatography has been developed. Mass spectrometry was employed as an aid in identification of the esters. Maize kernels contain three groups of esters of IAA: (a) IAA myoinositols, (b) IAA myoinositol arabinosides, and (c) IAA myoinositol galactosides. Each group has three chromatographically distinguishable isomers. The glycosylinositols described are unique in that carbon 1 of the sugar is attached to the hydroxyl at C-5 of the myoinositol.

Journal Article↗
PubMed1969

A Quantitative Estimation of Alkali-labile Indole-3-Acetic Acid Compounds in Dormant and Germinating Maize Kernels.

An estimate has been made of the quantities of alkali-labile esters of indoleacetic acid (IAA) in kernels of sweet corn (Zea mays). The amount is between 70 to 90 mg of IAA per kilogram of dry kernels. About one-half of the IAA is present as high molecular weight esters and the remaining one-half as esters of myo-inositol. Free IAA, which may have existed in the kernels, or may have resulted from ester hydrolysis during isolation or storage, amounts to between 1 to 10% of the esterified IAA. Five newly observed low molecular weight indoleacetyl compounds are described and their chromatographic behavior reported. The total IAA content of corn kernels and intact seedlings decreases during germination, declining to about 10% of the original content during 96 hr of germination. Difficulties in obtaining quantitative results and the possible physiological significance of these results is discussed.

Journal Article↗